Qt: fixed crash when using Halt(). issue #26911


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46635 4005530d-fff6-0310-9dd1-cebe43e6787f
anchordocking: options dlg: fixed enable/disable header options

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46636 4005530d-fff6-0310-9dd1-cebe43e6787f